NO. 1 



EMERY AND HULSEMANN: SUBMARINE CANYONS 



35 



Fig. 17. — Profiles of submarine canyons compared with lithol- 

 ogy where known. Symbols are as follows: arrow, shore- 

 line; K, Cretaceous; E, Eocene; M, Miocene; P, Plio- 

 cene; Q, Quaternary; R, postglacial (on sea floor letters 

 show sites of dateable rock samples). From Emery 

 (1960a, fig. 48). 



WATER 



Those who have spent much time aboard ship watching traces be- 

 ing drawn by echo sounders frequently observe echoes from dense 

 schools of fish which are often present at the tops of slopes, including 

 those at the sides and heads of submarine canyons. Some verification is 

 provided by the reportedly greater catch of fish at the head and sides 



